The XM Plus receiver from FrSky is one of the tiniest receivers and is perfect smaller sized crafts and drones. In this how-to guide we will dig a little deeper into the receiver and also look at the In this article/how-to guide, we will take a look into the XM Plus  receiver, its specs and an how to replace the FrSky XM Plus Antenna.

FrSky XM Plus Receiver

The FrSky XM Plus receiver is a tiny diversity receiver from FrSky which showcases full-range capability which, unlike some 3rd party receivers, which only provides limited range compared to  FrSky original 1st party receivers which will provide you with the required range for your normal day-to-day flying. The diversity set up will provide you with extra coverage compared to the standard XM receiver as well.

 

Specifications:

 

Compatibility

FrSky D16 mode

Dimension

21.5*12*3.5mm(L x W x H)

Weight

1.6g

Operating Range

Full range

Operating Voltage Range

3.7V~10V

Operating Current

[email protected]

Number of Channels

Up to 16CH from SBUS

 

The XM Plus was created as a successor to the tiny XM receiver but with the added benefit of being a diversity setup. The XM+ is basically the same receiver as the XM, but with the advantage of antenna diversity so if you can spend the extra dollar or two, I would suggest getting this receiver instead.

Construction of FrSky XM Plus Antenna

The antenna of a receiver would be the black colour wire(s) from the receiver but the actual radiating part of the antenna, which transmits and receives the signal is often referred to as the “active element”.

These type of linear antennas are made up a special cable known as a coaxial cable (or coax for short). Just like the TV signal cable you might have at home, these coax cables have the same construction.

 

The primary casing or covering sheath is usually a black plastic to protect the delicate insides from the physical stress and damage during handling.

The second layer is a ground layer composed wire strands whose purpose is to protect the signal wire against unwanted noise and disturbance to the signal being transmitted (or received) and to make sure there is no signal leakage till the final end of the transmitting element.

The third layer is used as another insulation layer and is directly laid on the active wire to prevent shorting with the ground layer.

The final fourth and final layer is that the actual active element wire where the signal travels from the device it's connected to. This part is what is refers to the actual “antenna” part which receives and transmits data from and to the receiver.

If in any case, you have accidentally cut away the active element(the transparent part where the black plastic shielding is not present), the easiest way to fix the receiver and reuse the antenna is just to strip some of that shielding to show 23.5mm of the active element which is different from the usual 31.2mm we see in other receivers.

A clean-cut from the distance explained about from the plastic shielding will provide the best reception.

Measure 23mm from the end where you have just made a cut and strip the insulation until you are left with the active element. This length of 23mm is special for the FrSky XM antenna because FrSky has “tuned” their antennas in the PCB board.

Replacing the FrSky XM Plus Antenna

In a worst-case scenario where you lose the entire antenna, you might be required to order a replacement antenna. Replacing the antenna is quite simple where you just unplug it from the receiver and attach the new antenna. Do keep in mind that the components on the receivers are quite sensitive and requires careful handling. Any Electrostatic Discharge (ESD) might damage these delicate components and so it is advised to use proper grounding while working on or soldering the receiver.

Conclusion

In this article, we have seen about the FrSky XM Plus antenna and what needs to be done to replace it on your quad for a happy flying. This article is not necessarily particularly for the FrSky XM Plus but can be applicable for other mini receivers as well but with the change that the active elements total length is 31.23mm instead of the 23mm for the XM Plus as shown in this article.